[pure-silver] Re: New color head "discoveries"
- From: DarkroomMagic <info@xxxxxxxxxxxxxxxx>
- To: PureSilverNew <pure-silver@xxxxxxxxxxxxx>
- Date: Thu, 13 Jan 2005 19:18:18 +0100
That is a good point. If one has frequently the need for more contrast,
while printing, the negatives are either underexposed, underdeveloped, or
both (assuming the filtration is OK). Changing exposure and/or development
can remedy the situation.
Regards
Ralph W. Lambrecht
On 1/13/05 6:56 PM, "Rob Champagne" <app@xxxxxxxxxxxxxxxxxxxxxx> wrote:
> big snip
>
>> The filters of a color head will not give you the full
>> range of contrast available from VC paper with the use of
>> dedicated filters. They should give you a couple contrast
>> grades on either side of "normal" but filters should be used
>> to obtain the maximum and minimum contrast values.
>
> big snip
>
>> ---
>> Richard Knoppow
>
> I wonder whether my observation is true for other dichroic filter head
> enlargers.
> The Ilford Y+M figures for grade 2 on my Durst CLS501 head enlarger give
> approx an ISO grade 1 result on paper.
> It occurs to me that because dichroic filtration does not seem to give as much
> contrast as filter sets, and because most new enlargers have dichroic heads,
> that Ilford, and maybe other manufacturers, use this to its advantage in terms
> of film speed.
> To get a true ISO grade 2 using ilfords G2 Y+M figures for my enlarger I have
> to give the negative more development which in turn gives allows a faster film
> speed.
> So what I'm speculating here is that modern film speeds may be tailored by the
> manufacturers to suit printing on dichroic heads with Y+M filtration.
> It should be noted that by using increased development of the negative the
> overall contrast obtainable from a dichroic is not far short of a true G5 and
> if you take neg development far enough then a true G5 is obtainable from a
> dichroic head.
>
> It all depends on what you are tailoring your development to. Do it to 0
> filtration and your negs will be too soft for G5 on dichroic settings. Do it
> to G2 Y+M settings of your dichroic head and you will get faster film speed
> and availability of higher contrast in your print.
>
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